The blood of radical menstruation is sometimes brownish in color and sometimes it may be bright red as well. In the early stages of pregnancy, women may experience a small amount of vaginal bleeding on the days of menstruation, and if the blood stays in the uterine cavity for a longer period of time, it becomes brown when it flows out. If the blood is just discharged and stays for a shorter period of time it becomes bright red blood. Women after menstruation brown blood, is an individual reaction, only a few women will appear, note that as long as it does not affect the growth and development of the embryo, pay attention to keep the vulva clean and hygienic, you can first temporarily observe. The phenomenon of stimulated menstruation will disappear in the future as the embryo grows and develops and becomes firm after implantation. If a woman experiences heavy vaginal bleeding and persistent lower abdominal pain during menstruation, she should go to the hospital for a gynecological ultrasound and human chorionic gonadotropin examination to rule out the possibility of preeclampsia.